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The injection stretch blow molding technique is a very popular technique in the plastic industry, especially for making PET bottles. This technique comprises further two methods of production: A single-stage process; and, a two-stage process. Let’s talk about the two-stage process first. In the two-stage injection stretch blow molding process, plastic preforms are made first of all, by employing the injection molding technique (you can learn about this technique in a separate article).